It would be "
Fearless Marksman of Mirkwood." You couldn't come up with a more creative name for it, though?
He's overpowered with Hunter, and has too much gametext to fit on a card with lore, just so you know. But he seemed to work better alone in the movies, so why would you make a card that overpowers the already powerful Elven archery army?
Make Thranduil Strength 7 and Resistance 7 to mirror
Durin III. You don't need the "Archery" keyword if his text is "At the start of the archery phase..." Personally, I would just make it:
Archery: Exert Thranduil twice and make the Fellowship archery total -2 to discard a condition.
The second part of the game text makes him too powerful.
Check out my Thraduil ideas on The Hobbit TCG!
-wtk